Motor generator



C. H. BUNCH.

MOTOR GENERATOR.

APPLICATION FILED MAR.3I. 1920.

1,4195 935 Patented Feb. 7, 1922.

2 SHEETS-SHEET 1.

Even far @044, 715 @a/z/w/Q m Wa da,

C. HfBUNCH.

MOTOR GENERATOR.

.APPLICATION FILED MAR. 31, 1920.

4 mm WMMS i P i @j CHARLES harem orator.

ax. BUNCH, or cnavanmm, omo, assronoa '10 ran some nnno'rnica me. ('16.,@753 CEEVELAND," OHIO, A CORPORATION OF OHIO.

HQTOEI GENERATOR.

specification of Letters Patent. Patented Feb. 7, 1922.

Application and Karen 31, 1920. Serial No. 370,285.

To all whom "it may concern: I

Be it known that 1, CHARLES H. BUNCH, a citizen of the United States,residing at Cleveland, in the county of Guyahoga and State of (lhio,have invented a certain new and useful Improvement in Motor Generators,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings.

This invention relates to improvements in vertical motor generatorsets,- especially to the type adapted for low. voltage use, such ascharging batteries Heretofore the frame or" a vertical motor generatorset was made in two sections, the tion by studs, which extended from theupper 'sectioii to the lower part of the lower section. This method ofassembly involved considerable time since the drilling and the tappingof holes was carried on under mechanical difficulties particularly suchas inac- .'cessibility of parts. In assembling the stator of the motorit was customary to insort the field laminations,one at a time into theframe, and then to force the entire set into a position .where it couldbe locked by a plurality of keys. While they were thus held in positionthe" desired phase winding was inserted in the laminations. It has beenproven that this method or" construction involves a considerable wasteof time, and that the method of securing the laminations to the frame isnot entirely practical. Frequently the lower armature bearing iequiredadjustment, and to eifect this. it was necessary to remove the top ofthe frame, then the cap over the commutator and finally the shaft withthe rotor secured thereto. This, of course, made theadjustment adifiicult one inasmuch asa crane was required to lift the shaft out ofthe bearings.

An essential object of my invention is to provide means for enabling thestator of the motor to be wound independently of its position withrespect to the frame, whereby the stator can be handled as a unit andin- {sorted when desired into the frame.

Another object is to construct the motor frame in such a manner that thelower hearin may be adjusted without removing the she I accomplish.thesabove objects by cutting the lower section near the base andinserting the lower bearing for the'sl aft Within the ower section beingsecured to the upper secportion which in my construction constitutes thebase of the motor generator set. I further provide end-ringswhich arepositioned at each end of the stator laminations, and which are adaptedto be drawn together by the application of a moderate degree ofpressure.

I have illustrated convenient embodiments of my invention in thedrawings herein. The

method of accomplishing the above and other objects will become apparentin the following description which relates to the drawings. Theessential characteristics are summarized in the claims.

In the drawings Fig. 1 is a side elevationpartly in cross section of avertical motor generator set; Fig. 2 is a section through the generatoras shown on the line 22 in Fig. 1; Fig. 3 is a section throupgh themotor as shown on the line 3-3 in ig. 1; Fig. 4 is a side elevationpartly in cross section of the motor frame showing the motor stator inposition; Figs. 5 and 6 are details of the end rings used to hold thestator laminations to ether.

i escribing the parts by the usev of reference characters in Fig. 1, theframe, which houses the motor generator, comprises an vupper section 10secured to the lower section 11, a top 12 and a base 13. Within theframe and at the lower end thereof the motor unit, while directly aboveit is the generator ,unit; Rigid secured. to the section 11 of the frameis t e stator of the motor comprising the usual windings 14 in thelaminations 15. Mounted'within the frame is the shaft 16 which carriesthe'rotor 17, of the motor, together with the armature 24 and acommutater 25 of the generator. The shaft 16 is supported by the bearing18 in the base 13 and by another bearing at the top of the shaft in thecap 12.

My invention relates to the method of construction and manner of securinthe stator of the motor'to the frame... "f0 assemble the stator I preferto use a mandrel on which the laminations can be stacked, and at eachend of the stack 1 place a ring as at 21 and 22. These rings, beingpreferably circular in form and concentric with the laminations as shownin Fig. 6, may then be urged toward each other to clamp the laminationsby tightening the nuts 44 and 45 Q1)- thobolte 41. As shown in Figs. 5and throu h which a p urality of bolts may be passe referably arrangedso that half of the num er of securing olts serve to hold the end ringstogether, while the other half extend outwardly from both ends of thelaminations and will serve to secure the stator to the frame. "After thelaminations are forced together and held in position by the rings, andbefore the unit is inserted in the frame, the stator may be wound forany hase windin orcurrent desired, and then mserted in t e section 11,and centered therein by a plurality of ribs 31 extending inwardly fromthe frame. As shown in Figs. 2 and 3, these ribs are preferably arrangedso that one of the bolts, hereinbefore mentioned, may then be insertedbetween adjacent I'lbS. The inner faces of the ribs are machined to asize and closely embrace the outer riphery of the laminations as shownin 4. The bolts 41 which extend beyond both ends of the stator may besecured to lugs 42 in section 10 and at their lower ends to the base 13.

If a stator has been wound for a certain phase of current and insertedin a frame,

then to change the winding so as to adapt the motor for a different typeof current it is only necessary to remove the bolts which extendthrough. the lam'inations and the base, then to slip the entire statorfrom its position and to insert another stator wound for the phase ofcurrent desired.- It will be seen with such an arrangement, that byloosening the nuts of the bolts which secure the base to the lowersection, that'the base can be removed and the lower bearing madeaccessible for adjustment or repair, whilethe shaft is held in bearing.I

It will be seen from the foregoing description that I have provided. astator that can be completely finished and wound before placing it intheframe. This feature makes position by the upper for cheapness inmanufacturin costs. My invention permits of economy 1n supplying therequirements 'of a manufacturer, in that a comparatively large number,of stators, embodying various phases and other electricalcharacteristics, may be kept for selecttion and use with any of asmaller number of frames. This is of commercial value inasmuch as thecost of a frame is greatly in excess of the cost of a stator.

I claim:

1. In a vertical motor generator set, the combination with a frame, of amotor stator comprising laminations, removable end rings positioned oneach end of the. stator, ribs extending longitudinally of the frame andabutting the outer periphery of the laminations, said 'ribs being out ofcontact with the end rings, two sets-of bolts, one of said setsterminating adjacent the end rings, the other of said sets extendingthrough the stator and connecting it with the frame, and all of saidbolts being positioned intermediate the stator and the frame.

2. In a motor generator set, the combination with a frame comprising ahousing for the generator, a housing for the motor and a base, radialribs projecting inwardly from the motor housing, a motor statorcomprising laminations and end rings, the laminations being in abuttingengagement with the ribs, said rings having lugs projecting outratedribs extending the entire length of the motor housing, a motor statorcomprising laminations and end rings, the laminations being in abuttingengagement with the ribs, end rings having lugs that extend outwardly beond the laminations, there being one of sald lugs intermediate a. pairof adjacent ribs, two sets of bolts extending through said lugs andpositioned alternately therethrough, one of said sets terminatingadjacent the end rings, the other of said sets extending beyond the endrings and having the ends thereof connected with the lugs on thegenerator housing and the base respectively.

In testimony whereof, I hereunto aflix my signature.

